// Copyright (c) Six Labors.
// Licensed under the Six Labors Split License.

using System.Collections.Generic;

namespace SixLabors.Fonts.Unicode {
  /// <summary>
  /// A simple bi-directional dictionary.
  /// </summary>
  /// <typeparam name="T1">Key type</typeparam>
  /// <typeparam name="T2">Value type</typeparam>
  internal sealed class BidiDictionary<T1, T2>
      where T1 : struct
      where T2 : struct
  {
      public Dictionary<T1, T2> Forward { get; } = new Dictionary<T1, T2>();

      public Dictionary<T2, T1> Reverse { get; } = new Dictionary<T2, T1>();

      public void Clear()
      {
          this.Forward.Clear();
          this.Reverse.Clear();
      }

      public void Add(T1 key, T2 value)
      {
          this.Forward.Add(key, value);
          this.Reverse.Add(value, key);
      }

      public bool TryGetValue(T1 key, out T2 value) => this.Forward.TryGetValue(key, out value);

      public bool TryGetKey(T2 value, out T1 key) => this.Reverse.TryGetValue(value, out key);

      public bool ContainsKey(T1 key) => this.Forward.ContainsKey(key);

      public bool ContainsValue(T2 value) => this.Reverse.ContainsKey(value);
  }
}